Heat-transferring apparatus.



HAYDENV u.V TRACY, o'FsAN FRANCISCO, CALIFORNIA.

- HEAT-TRANSFERRING. '.APPA'RATUS.

Speceaton of Letters Patent.

Appiioaiionfuea rebrwylaisoe. serialnasoioa f T0 all whom, t mayoon/cern:

Be it known that I, HAYDEN H. TRACY, a citizen of the United States ofAmerica, residing at San Francisco, county of San Francisco, and Stateof California, have invented Certain new and useful Improvements inHeat-Transferring Apparatus; and I hereby declare the following to be afull, clear, and exact description of the same, reference being had tothe accompanying drawings, forming a part of this specification.

This invention relates to certain improvements in apparatus for thetransfer of heat, and is especially applicable to reheating devicesinterposed between the high and low pressure cylinders of reciprocatingsteam-engines orin any case whensteam or other elastic fluid is to beheated or reheated.

My improvements consist in a series or tiers of pipes of thin sectionthrough which an elastic fluid to be heated or cooled is passed, thesepipes being surrounded by and exposed to the temperature of anotherfluid, such as the furnace gases of combustion, and consist especiallyin a means to cause a uniform 'flow of the liquid to be heated or cooledthrough the manifolds or tiers of pipes by adjusting 4their aggregatedarea so as to cause a uniform flow and distribution of the steam orother fluid to be heated through all the pipes at a minimum velocity,and consef quently permit the greatest possible transfer of heat. Themeans employed to accomplish this purpose are very simple, consistingusually of a sliding register-damper, baffling plate, or like devices tocover and reduce equally the bare tubes at their ends, producingsufficient back pressure in the supplypipes to cause a like flow in eachtube of the heater. A like result can be attained, but withoutadjustment, by inserting ferrules or bushing-collars in the tubes; butas the variations of pressure or volume and other circumstances ofapplication maydemand adjustment I adopt the devices shown in thedrawings now to be hereinafter described.

To apply my invention in practice, I employ devices substantially asshown in the drawingsherewith and forming a part of this specification.

Figure I is an elevation, partially in section, of apparatus toillustrate my invention; Fig. II, aview, partially broken away, of theback of one of the junction-boxes; Fig. III, a partial horizontalsection through one of the junction-boxes Von the line a, in Fig. I, andFig. IV an end view of one of thetubes with a reducing-ferrule inserted.

1 is a chimney, flue, or other conduit for hot gases and may be verticalor horizontal.

2 is a tier of heating-pipes connecting to and combined by thejunction-boxes 3 and 4 1snd arranged in units/of any required num- 5 isa supply-pipe through which passes steam or other elastic fluid to beheated to the junction-box 3, and 7 a continuation of the pipe 5 for theiiuid after it has passed through the pipes 2 in the direction indicatedby arrows toward the ,outflow-pipe 7.

When the desired contraction of the tubes 2 is known or is determined byexperiment for an unchangeable volume to be passed through them, theirarea can be reduced to the desired size by means of insertedcollars orferrules 15, as shown in Fig. IV.

yIn the junction-box 3 I provide a sliding register-plate 8, havingperforationsl 9, that correspond to the ends of the tubes 2, so arrangedas to partially cover the latter, as shown in Fig. II. This plate 8 asarranged is moved longitudinally by an oscillating shaft 10, operated bya handle 12, and is connected to the plate 8 by a crank 13 and link 14,as shown in Figs. II and III, but may be operated in any suitablemanner.

. In operating as a heater between the high Patented Dec.1s,19o6. Y

and low pressure cylinders of a steam-engine,

the most common use of the apparatus, steam from the engine isdischarged' through the pipe 5 into the junctionbox 3. Contraction ofthe ends of the tubes 2, caused by the register or damper-plate 8,causes a slight back pressure and produces an equal iiow of steamthrough all the tubes at a velocity as low as the volume will permit. f'A Without the register-plate 8 or like means of Controlling the area.of the tubes 2 the steam would pass through them irregularly, tendingto travel through the cooler tubes, and the transfer of heat from thehot gases be less effective. A

I have described my invention especially as applied to an interheaterfor multiple-cylinder expanding steam-engines; but it will be obviousthat it is alike applicable to any engine, also to cooling processes, asin aircompressing, and that the conduit 1 may contain a cooling fluidinstead of hot gases.

Having thus Adescribed the nature and ob- IOO IIO

jects of my invention and a manner of applying the same, what I believeto be new, and desire to secure by Letters Patent, is-

In heat-transferring apparatus, a heatingohamber, headers on oppositesides of said chamber, a set of multiple tubes in said chamber, between4said headers, connected with the latter and forming communicationbetween them, an inlet-pipe for fluid to one header, an outlet-pipe tothe other header, a register-valve in one header for regulating theeEeetive apertures of said multiple tubes simultaneously, and means foroperating said valve, substantially as specified.

In testimony whereof I have signed my 15 name to this specification inthe presence of two subscribing witnesses.

HAYDEN H. TRACY.

Witnesses GEORGE PATTIsoN, ELMER WIoKEs.

